Electric cables



(No Model.)

R. A. DENISON.

INSULATINC ELECTRIC CABLES.

Patented Jan. 26, 1886.

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UNTTED STATES PATENT OEEICE.

RUSSEL A. DENISON, OF PROVIDENCE, RHODE ISLAND.

INSULATING ELECTRIC CABLES.

SPECIFICATION forming part of Letters Patent No. 334,850, dated January 26', 1886.

.Application filed August 12, 1885. Serial No. 174,170.

To all whom t may concern.-

Be it known that I, RUssEL A. DENrsoN, a citizen of the United States, residing atProvidence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Insulating Electric Cables, and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or gures of reference marked thereon, which form a part of this specification.

This invention relates to an armor or shield for electric wires or cables; and it consists, essentially, of a sheet or strip of asbestus paper or felting, covered on one or both sides with a layer of insulating material composed of crushed fossil bituminous rock, combined with Trinidad asphalt tempered with mineral oil and eowdie gum for the purpose of rendering the sheet impervious to the action of water and air. The sheet is then covered on one side with a thin layer of pulverized glass and mica, suitably tempered, after which the coated sheet is pressed or molded to produce therein a series of parallel corrngations.

The invention further consists of a bandcable composed of two strips or sheets of said corrugated and coated asbestus paper,bet.ween which the wires are placed and hermetically sealed by means of hot asphaltic cement, when, finally, the whole is passed between heated corrugated 'rolls for thc purpose of compressing or Compacting the parts, thus forming an insulated band-cable adapted to be laid under ground and used for telegraphic, telephonie, or electric-lighting purposes, all as will be more fully hereinafter set forth and claimed.

The object of this invention is to provide a band-cable with a coating or armor which is less expensive, and at the same possessing greater efficiency as compared with other analogous cables heretofore in use.

The invention is illust-rated in the accompanying sheet of drawings, in which Figure 1 represents a cross-sectional view of the strip or web of asbestus paper or felting which forms the base ofthe armor. Fig. 2 is a view of the same after being coated with the layers (No model.)

of asphaltic material composed of crushed fossil bituminous stone and Trinidad asphalt suitably tempered with cowdie gum and mineral oil. Fig. 3 is a cross-sectional view of the coated strip,having in addition a thin layer of pulverized glass and mica, b2. Fig. t is an enlarged crosssectional view of the prepared sheet or armor after being corrugated for the reception of the electric conducting -wires. Fig. 5 is a reduced view of the same. Fig. 6 is a cross-sectional view of the completed cable having three wires. Fig. 7 is a plan view of the same. Fig. 8 is a cross-sectional view of the cable as provided with six wires. Fig. 9 is a crosssectional viewof a metallic trough lined with insulating material, and showing a series of cables therein as provided with my improved armor, said trough being divided laterally into three divisions for the purpose of carrying three systems of cables-as, for example, telegraphic, electriclighting, and telephonie uses-the whole being adapted to be placed under ground; and Fig. l() represents a modification of the same, wherein a wooden box or trough is used in lieu of the metallic one.

The following is a more detailed description of the invention, including the manner of its construction and operation:

B, again referring to the drawings, designates the corrugatec'l armor or shield,composed ofthe asbestns paper or felting base b,covered with the preserving coats or layers b', the latter consisting of crushed or tine particles of bituminous rock combined with hot Trinidad asphalt tempered with cowdie gum and mineral oil. After this coating becomes sufficiently hardened, a final layer, b2, of pulverous glass and mica is spread evenly over the upper surface of said shield, when, finally, the strip or web is passed between corrugated rolls, or othersuitablc process,for the purpose of' forming therein the series of concave-con- Vex-shaped longitudinal grooves or corrugations c c', thus completing its construction, and adapting the same ready for use. The band-cable A is composed of a series of conducting-wires, c, covered both top and bottoni with said shields B. The wires each are placed in a groove, c, (of the armor B,) and covered with melted asphalt or other suitable cement, after which the top portion, B, ofthe cable is placed in position over said-wires, when,

finally, the whole is passed between heated' rolls, or other equivalent means, for the purpose of cementing all the parts firmly together, the'nished cable then appearing,substan tially as represented in Figs. 6, 7, 8, tc. The cable is now adapted to be laid under ground or water, and used for conducting the electric current or iluid, as desired, the shield or armor thus constructed forming a comparatively perfect insulator for the inclosed wires. The cable also will last an indefinite period, it not being subject to decomposition, the elements composing the same being practically indestructible and unaffected by heat or cold.

In Fig. 9my improved cable is represented aslying within a metallic trough, F,'which is lined with non-conducting material n-such as fossil-meal and asbestus-appliedin a plastic state, the whole being covered and sealed by means of the lid or cover F.

I am aware that it is not broadly new to arrange wires in the form of a fiat-band cable, wherein said wires are separated from each other by means of insulating material.

Having thus described my invention, what I do claim as new, and desire to secure by United States Letters Patent, is-

l. As an improved article of manufacture, the insulating material for electric wires,here in described, the same consisting of the asbestus felt or paper base coated or saturated with crushed bituminous rock and Trinidad asphalt tempered with cowdie gum and mineral oil, a layer of pulverized glass and mica spread evenly over the surface, and the whole rolled or otherwise formed into webs or sheets having a series of continuous grooves or corrugations, as and for the purposes set forth.

2. The improved corrugated armor or shield B, herein described, consisting of the asbestus base b, enveloped by the asphaltic composition b, and the thin layer b2 of pulverized glass and mica covering the inner or concave surface of the said shield, substantially as shown, and for the purposes set forth.

3. The iiat-band cable A, herein described, consisting of a series of conducting-wires, a, arranged within the two strips or Webs of corrugated insulating material'B, composed vof asbestus b, covered with asphaltic composition b', and powdered glass and mica b2, all combined and arranged substantially as shown and hereinbefore set forth.

4. The combination,within the two closely- -cemented corrugated strips or webs of insulating armor B, composed of asbestus,asphalt, and powdered glass and mica, substantially as set forth, ofthe conducting-wires a, arranged in said corrugations, substantially as shown, and for the purposes hereinbefore described.k

In testimony whereof I have affixed my signature in presence of two witnesses.

RUSSEL A. DENISON. Witnesses:

GEO. H. REMINGTON, CHARLEs HANNIGAN. 

